In elftoolchain you'll see some elfs having a size of 52 instead of 64
https://github.com/sergev/elftoolchain/search?utf8=%E2%9C%93...
Also it is interesting that the powerpc elf loader verifies that the e_ehsize is the same size as the allocated buffer, perhaps they had an issue at one point.
https://github.com/torvalds/linux/blob/ba6d973f78eb62ffebb32...